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Bifurcations in Mathematical Model of Nonlinear Vibration of the Nuclear Fuel Rod

Citace:
DYK, Š., ZEMAN, V. Bifurcations in Mathematical Model of Nonlinear Vibration of the Nuclear Fuel Rod. In Engineering mechanics 2015. Praha: 2015. s. 56-57. ISBN: 978-80-86246-42-0 , ISSN: 1805-8248
Druh: STAŤ VE SBORNÍKU
Jazyk publikace: eng
Anglický název: Bifurcations in Mathematical Model of Nonlinear Vibration of the Nuclear Fuel Rod
Rok vydání: 2015
Místo konání: Praha
Autoři: Ing. Štěpán Dyk , Prof. Ing. Vladimír Zeman DrSc. ,
Abstrakt EN: The paper deals with nonlinear phenomena occurring during vibration of nuclear fuel rod (FR). The FR is considered as a system consisting of two impact-interacting subsystems - FR cladding (zircalloy tube) and fuel pellets stack placed inside FR cladding. Between both subsystems, there is a small clearance. The FR is bottom-end fixed, and at eight equidistant levels, the FR cladding is supported by spacer grids (SG). Both subsystems are modelled by means of finite element method for one-dimensional Euler-Bernoulli continua. During fuel assembly (FA) motion caused by pressure pulsations of the coolant, the FR vibrates and impacts can possibly occur between FR cladding and fuel pellets stack. The paper focuses on qualitative change of vibration with change of bifurcation parameters - clearance between FR cladding and fuel pellets stack, stiffness of spacer grids cells and excitation frequency. The change of vibration quality is shown using extremes of relative radial displacements of both tubes in discretization nodes, and phase trajectories.
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